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Technical Data Sheet
PartsTable / COMPONENT / MS51940-3S
MS51940-3S ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The BUCKLE is a the manufacturer industrial component. Key specifications include color: BLACK, insignia: NOT INCLUDED, material: STEEL OVERALL, overall_width: 1.030 INCHES NOMINAL IN, overall_length: 1.310 INCHES NOMINAL IN, enameled_feature: INCLUDED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-821-5871, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
MS51940-3S
NSN: 5340-00-821-5871
FSC: 5340
CAGE: T0720 — FNSS SAVUNMA SISTEMLERI ANONIM SIRKETI (TUR)
SPECIFICATIONS
colorBLACK
insigniaNOT INCLUDED
materialSTEEL OVERALL
overall_width1.030 INCHES NOMINAL IN
overall_length1.310 INCHES NOMINAL IN
enameled_featureINCLUDED
surface_treatmentZINC AND PHOSPHATE
buckle_style_designatorCENTER BAR
strap_accommodation_width1.060 INCHES NOMINAL IN
NSN5340-00-821-5871
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MS51940-3S MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT: ZINC AND PHOSPHATE
•
INSIGNIA: NOT INCLUDED
•
COLOR: BLACK
•
STRAP ACCOMMODATION WIDTH: 1.060 INCHES NOMINAL IN
•
ENAMELED FEATURE: INCLUDED
•
BUCKLE STYLE DESIGNATOR: CENTER BAR
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL OVERALL
SURFACE TREATMENTZINC AND PHOSPHATE
INSIGNIANOT INCLUDED
COLORBLACK
STRAP ACCOMMODATION WIDTH1.060 INCHES NOMINAL IN
ENAMELED FEATUREINCLUDED
BUCKLE STYLE DESIGNATORCENTER BAR
OVERALL LENGTH1.310 INCHES NOMINAL IN
OVERALL WIDTH1.030 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
02300-1Interchangeable
interchangeable cross-reference
interchangeable
A-A-55620Interchangeable
interchangeable cross-reference
interchangeable
826720Interchangeable
interchangeable cross-reference
interchangeable
A-A-55620-10Interchangeable
interchangeable cross-reference
interchangeable
MS51940-10Interchangeable
interchangeable cross-reference
interchangeable
MS51940-4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51940-3S?
MS51940-3S is a BUCKLE.
What parts can replace MS51940-3S?
There are 14 known substitutes for MS51940-3S: 02300-1, A-A-55620, 826720 and 11 more. Substitute compatibility should be verified for your specific system.
Is MS51940-3S still available?
MS51940-3S is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026